Overestimation of diastolic blood pressure in the elderly. Magnitude of the problem and a potential solution
Insights
Indirect blood pressure measurement may overestimate readings in elderly patients. An automatic blood pressure recorder provided a more accurate, noninvasive measure of diastolic blood pressure (DBP) compared to traditional methods.
Area of Science:
- Cardiology
- Geriatrics
- Biomedical Engineering
Background:
- Indirect sphygmomanometry is standard for hypertension but can overestimate blood pressure in the elderly.
- Overestimation may lead to unnecessary or excessive hypertension treatment in older adults.
Purpose of the Study:
- To assess the degree of diastolic blood pressure (DBP) overestimation by indirect methods in elderly hypertensive men.
- To evaluate an automatic blood pressure recorder as a more accurate noninvasive alternative.
Main Methods:
- Compared direct intraarterial DBP with indirect measurements from a mercury sphygmomanometer and an automatic recorder.
- Study included 36 elderly men (≥60 years) with hypertension.
Main Results:
- The mercury sphygmomanometer overestimated elevated DBP frequency nearly threefold compared to intraarterial measurements (39% vs. 14%).
- The automatic recorder showed closer agreement with intraarterial DBP, with fewer patients exceeding 90 mmHg (19% vs. 14%).
- Significant differences in overestimation were noted between the mercury sphygmomanometer and automatic recorder versus intraarterial DBP (P < 0.05).
Conclusions:
- Traditional indirect sphygmomanometry frequently overestimates DBP in elderly hypertensive patients.
- Automatic blood pressure recorders offer a more accurate and reliable noninvasive method for DBP measurement in this population.
Abstract:
Indirect sphygmomanometric blood pressure measurement is the established method of diagnosing and monitoring hypertension, but it may overestimate the true blood pressure in certain elderly patients leading to unnecessary or excessive treatment. The authors studied 36 elderly (aged 60 years or older) hypertensive men and compared direct intraarterial diastolic blood pressure (DBP) measurements with indirect DBP measurements obtained concurrently by a standard mercury sphygmomanometer and also by an automatic blood pressure recorder to: assess the presence and degree of overestimation of DBP by indirect cuff measurement, and evaluate an alternative noninvasive method. The difference between sphygmomanometric and intraarterial DBP was 10 mmHg or greater in 14 of 36 patients, whereas that between the automatic recorder and intraarterial DBP was 10 mmHg or greater in 14 of 36 patients, whereas the between the automatic recorder and intraarterial DBP was 10 mmHg or greater in only three of 36 patients (P less than 0.05). Fourteen patients (39%) had a DBP of greater than or equal to 90 mmHg by the mercury sphygmomanometer compared with five patients (14%) by intraarterial measurement (P less than 0.05); only seven patients (19%) had a DBP of greater than or equal to 90 mmHg by the automatic recorder (P = .7). Thus, in the authors' patient population: indirect sphygmomanometer overestimated the frequency of elevated DBP by nearly threefold compared with intraarterial measurements, and the automatic recorder closely approximated intraarterial values offering a more accurate, noninvasive measure of DBP in the elderly.
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